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Unless you've got an "expensive" Freeview box that modulates its output on to the RF (Aerial) connector then you can't.
Most Freeview boxes have 2 aerial connectors - 1 IN from the Aerial itself and 1 OUT to connect to the TV - BUT this is ONLY a PASS-THROUGH connection. This means that the digital Freeview signal which is decoded from the aerial signals is NOT output on the OUT connector and sent down the co-axial cable to your TV. Only the "old" ANALOGUE (not Freeview NON DIGITAL) comes down that co-ax. What you should do is connect the Freeview box to your TV with a SCART cable via the SCART connectors on both. You need to select the AV input on the TV using the remote.
Even if you do have an "expensive" box that does modulate the digital decoded programmes and output these of the RF OUT connector, you should still use a SCART cable as the picture produced will be far better
Hope this helps

If you havent selected a PIN yourself, then it should still be the default.

The manual that came with it will tell you the default, but if you dont have the manual anymore, defaults commonly are 0000, 1111, 1234, 9999.

If you have set a PIN but cant remember it, somewhere in the menus is usually a "reset to factory defaults/configuration" that may reset the PIN back to the default. Otherwise, you'll just have to keep guessing your PIN !

Press the [i+] or MENU button on the remote control to display the DIGITAL INFO menu.

Press the BLUE button to display the MAIN MENU.

Press the UP or DOWN buttons to highlight AUTO TUNING then press the OK button to display the AUTO TUNING MENU.

Press the RED button to start the auto tuning process for all available digital channels.

Wait for the process to complete.

If you wish to CANCEL the auto tuning process whilst it is processing then press the BLUE button at any time.You may lose some channels when you retune the TV as the channels have been rearranged. To locate them look at the EPG although you may still find that some channels are no longer available on FREEVIEW. See the following link for additional informationhttp://www.freeview.co.uk/_retuneinfo/If the above process does not work then check the link above for additional information and also visit the accompanying site links below to find more information for your model of TV / FREEVIEW box.For troubleshooting the retune procedure visit http://tvretune.co.uk/troubleshooting/For specific model information visit http://tvretune.co.uk/productmanuals/

Ok
1) plug aerial in to the antena in sock on freeview box.
2) plug short aerial type lead in to rf out socket on freeview & antena in socket on TV.
3) plug A scart lead in to the socket marked TV on freeview box & the other end of scart in to one of the scart sockets on the TV.
If your TV has more than one socket plug it into the one marked AV1 or AV2.

4) plug in freeview to mains electricity & switch box on.
5) Turn TV on freeview should appear automatically if it doesnt look on your TV remote for A button marked AV or a button with either A circle or square with an arrow going through it you may need to press this several times until you see digi picture come up.
Thats basically it but do check that you dont need a new aerial etc to be able to get digi signal in your area.

How have you got freeveiw connected to your set and what input are you using?
when connecting the freeveiw unit to the tv did you have the power connected and turned on to either tv or freeveiw?
how many sets are connected to the freeveiw unit,
All these things can affect this equation,

it sounds like the set had a power surge from the plugging in of the freeview,
the f connection output from the freeveiw set has a live voltage feed that powers either the mast head amp or the balun in the center of the dish,
for these to work correctly the cable between the freeveiw and the aerial/dish needs power,
this annoying little fault can only be remedied by taking it to the repair man,